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EP0045538A1 - Optisches Gerät zum Aufzeichnen oder Wiedergeben von Informationsspuren mittels eines Strahlungsbündels - Google Patents

Optisches Gerät zum Aufzeichnen oder Wiedergeben von Informationsspuren mittels eines Strahlungsbündels Download PDF

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Publication number
EP0045538A1
EP0045538A1 EP81200785A EP81200785A EP0045538A1 EP 0045538 A1 EP0045538 A1 EP 0045538A1 EP 81200785 A EP81200785 A EP 81200785A EP 81200785 A EP81200785 A EP 81200785A EP 0045538 A1 EP0045538 A1 EP 0045538A1
Authority
EP
European Patent Office
Prior art keywords
objective
bearing
sleeve
optical axis
lens system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81200785A
Other languages
English (en)
French (fr)
Other versions
EP0045538B1 (de
Inventor
Wilhelmus Adrianus Henricus Gijzen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Priority to AT81200785T priority Critical patent/ATE11463T1/de
Publication of EP0045538A1 publication Critical patent/EP0045538A1/de
Application granted granted Critical
Publication of EP0045538B1 publication Critical patent/EP0045538B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking

Definitions

  • the invention relates to an optical apparatus for writing and/or reading recording tracks in a recording surface of a record carrier by means of a radiation beam which is produced by a radiation source for instance, for scanning video and/or audio recording tracks in a reflecting recording surface of a rotary video or audio disc by means of a light beam
  • apparatus comprises: a frame; an objective for concentrating the radiation bean to form a radiation spot in a focussing plane, which objective has an upper end which, during operation, faces the recording surface of a record carrier, and a lower end which is remote from the recording surface and comprises a lens system with an optical axis; a combined bearing arrangement for the objective, which arrangement is a combination of, firstly, a focussing bearing-arrangement which is adapted to permit focussing movements of the objective between a rest position and an operating position and relative to the frame in a direction which at least substantially coincides with the optical axis, so as to enable any deviations of the recording surface of the record carrier from a mean position in a direction perpendicular
  • Such an optical apparatus is known from United States Patent Specification 4,135,206.
  • the objective is journalled near its lower end in a corrugated loudspeaker diaphragm made of impregnated fabric fibre, which diaphragm allows the various movements of the objective.
  • the lens system is located near the upper end of the objective and is mounted in a tubular sleeve.
  • the diaphragm is connected to the lower end of the sleeve, near a cylindrical coil for the focussing movements.
  • For the pivotal movements there are provided coils which are connected to the objective near the upper end and which move in air gaps of associated permanent-magnet stators which are rigidly mounted on the frame.
  • optical disc players such as video disc players
  • the video disc rotates with a frequency of rotation of 50 or 60 Hz, depending on the local mains frequency. Irregularities in the disc surface give rise to focussing movements of the objective with a fundamental frequency of 50 or 60 Hz and, moreover, to harmonics with frequencies of approximately 5 or 6 kHz.
  • the sound waves produced by the moving objective therefore have frequencies which are situated in the very frequency range to which the human ear is highly sensitive.
  • a diaphragm for journalling the objective is to be regarded as less satisfactory in view of the reduction of annoying sounds.
  • a corrugated diaphragm made of fabric fibre does not present a high resistance to transverse movements of the objective, so that under certain conditions, apart from the desired focussing movements and pivotal movements; the objective may also perform translational movements transversely of the optical axis.
  • the diaphragm which should be rigidly connected to the objective and to the frame, furthermore militates against a rapid and easy replacement of the objective.
  • the combined bearing arrangement for the objective comprises a plain-bearing arrangement comprising a stationary bearing member which is connected to the frame and which has an outer bearing surface, or a plurality of outer bearing surfaces, which is arranged symmetrically around the optical axis of the objective, and which bearing surface, or each of which bearing surfaces, is convexly curved about axes perpendicular to said optical axis, as well as a movable bearing member which is connected to the objective and has an inner bearing surface, or surfaces, which cooperates, or cooperate, with the convex outer bearing surface, or surfaces, of the stationary bearing member in a sliding and pivoting manner.
  • cylinder is to be understood to mean any three-dimensional body having a constant cross-section perpendicular to a given axis through the body, which cross-section is bounded by a closed curve, and the cylindrical surface of the body being produced by a generative which extends parallel to said axis through the closed curve.
  • a cross-section of a cylinder need not be a circle. Should this be the case, the cylinder will be termed a "circular cylinder”.
  • “cylindrical” is to be understood to mean, relating to a cylinder in accordance with the foregoing definition.
  • an embodiment of the invention is of advantage which is characterized in that the sleeve is open at the lower end of the objective, the frame is provided with a bearing support which extends into the sleeve through the open lower end and has a free end which is directed towards the lens system., the stationary bearing member is located on the bearing support, and the movable bearing member is constituted by a portion of a wall of the sleeve.
  • the higher resistance of the bearing to transverse movements of the objective is obtained by connecting the bearing support rigidly to the frame and by giving the bearing support a high rigidity of its own.
  • the bearing clearance between the stationary and the movable bearing members can be comparatively small, for example of the order of magnitude of 10 microns, by the use of precision manufacturing methods.
  • the objective can readily be removed in the axial direction of the stationary bearing member and is therefore readily interchangeable.
  • An interesting embodiment of the invention is one in which the bearing support is at least partly hollow and is open at its free end, and in which the hollow part of the bearing support constitutes a housing for one or more optical and/or opto-electrical components which cooperate with the radiation beam.
  • the hollow part of the bearing support may also accommodate a radiation source, so that an optical device of very compact construction can be obtained, which comprises the radiation source and the optical parts of the light path as well as the electronic means for the necessary servo controls and for electrically coupling out the high-frequency signal which is modulated by the information on the record carrier.
  • a further embodiment of the invention is characterized in that near its free end the bearing support comprises a cylindrical stop portion which is substantially coaxial with the optical axis of the objective, and in that the sleeve of the objective has an inner wall which surrounds said cylindrical stop portion with clearance in order to limit the pivotal movements of the objective relative to the bearing support. This precludes excessive pivotal movements of the objective, which could give rise to problems in the servo control for the pivotal movements.
  • the bearing support and the sleeve of the objective are provided with seating surfaces which cooperate with each other in the rest position of the objective and which are inclined relative to the optical axis of the objective, in order to obtain a well-defined, substantially non-inclined rest position for the objective.
  • the objective is maintained in position by electromagnetic forces. However, it is important that in the rest position also the objective occupies a well-defined position, so that when the apparatus is put into operation the objective can start from said well-defined position, thereby allowing the servo controls to lock-in immediately after the seating surfaces are disengaged. This is to be understood to mean that immediately upon putting the apparatus into operation the objective occupies a geometrical position such that the servo controls which automatically control the position of the objective during operation are not actuated.
  • said electrically controllable focussing means and pivoting means comprise moving electrodynamic means which are connected to the objective as well as stationary electrodynamic means which are connected to the frame and which comprise a plurality of electric control coils and which cooperate magnetically with the moving electrodynamic means, so that by the application of electric control currents to the control coils electromagnetic forces can be exerted on the objective in order to effect focussing movements and pivotal movements thereof.
  • an embodiment of the invention is of significance which is characterized in that the moving electrodynamic means are situated at the sides of the sleeve and near its lower end and the moving electrodynamic means are oriented in such a way relative to the sleeve that the electromagnetic forces on the objective substantially extend through a common point on the optical axis of the lens system and said point substantially coincides with the centre of percussion of the objective.
  • the centre of percussion of a physical body is to be understood to mean the imaginary point on or in the body which, upon the application of an energy impulse to the body in a specific direction of percussion, performs a solely translational movement in the direction of percussion relative to an external frame of reference.
  • An energy impulse applied to the centre of percussion causes the entire physical body to move only translationally.
  • An energy impulse applied to a different point causes the body to perform a combined motion, the centre of percussion moving translationally and all other points moreover rotating about the centre of percussion.
  • the moving electrodynamic means may suitably comprise control coils with turns which are situated in planes perpendicular to an imaginary connecting line between the centre of the coil and the centre of percussion. During focussing movements of the objective such coils exert only a small sound pressure, because their projected area on a plane perpendicular to the optical axis is small.
  • the said stationary electrodynamic means may comprise an annular axially magnetised magnet which surrounds the bearing support, which annular magnet may be included in a magnetic circuit with polepieces which extend axially into the control coils and which are secured to the annular magnet.
  • an embodiment which contributes to a reduction of the sound pressure and which is characterized in that externally of the sleeve there is provid a plurality of fins having free ends, which are disposed in planes substantially parallel to the optical axis of the lens system, and in that the moving electrodynamic means are arranged on the free ends of the fins.
  • An embodiment of the invention in which rotary movements of the objective about the optical axis are not possible is characterized in that the stationary bearing member com-_ prises a first and a second pair of outer bearing surfaces, the first pair of surfaces comprising two part-cylindrical surfaces which are at least substantially disposed diametrically opposite one another on an imaginary first circular cylinder with a first diameter and a first axis which is substantially perpendicular to the optical axis of the lens system, and the second pair of surfaces comprising two part-cylindrical surfaces which are at least substantially disposed diametrically opposite one another on an imaginary second circular cylinder with a second diameter and a second axis which is substantially perpendicular to the optical axis of the lens system and also substantially perpendicular to the first
  • the optical apparatus 1 shown in Fig. 1 is suitable for writing and/or reading recording tracks in a reflecting recording surface of a rotary video disc 3 by means of a radiation beam 2, produced by a radiation source, not shown.
  • Said disc is rotatable about an axis of rotation 4 by means of a drive arrangement, not shown, which falls beyond the scope of the invention and is not discussed in more detail.
  • the optical apparatus 1 comprises a frame 5, relative to which an objective 6 is movable. Said objective serves for concentrating the radiation beam 2 to form a radiation spot 7 in a focussing plane.
  • the upper end 8 of the objective faces the recording surface of the video disc 3, its lower end 9 being remote from said disc, and the objective comprises a symbolically represented lens system 10 having an optical axis 11.
  • a combined bearing arrangement which is a combination of, firstly, a focussing bearing arrangement which is adapted to permit focussing movements 12 of the objective in a direction which substantially coincides with the direction of the optical axis 11 so as to enable any deviations of the recording surface of the video disc 3 from a mean position in directions perpendicular to the recording surface to be followed by the focussing plane, and secondly, a pivotal bearing arrangement which is adapted to permit pivotal movements of the objective 6 relative to the frame 5 in directions 13 and 14 about axes 15 and 16 substantially perpendicular to the optical axis 11 of the lens system 10, so as to enable any deviations of the recording track from a mean position in directions extending in the plane of the recording surface to be followed by the radiation spot 7.
  • pivotal movements 13 about the pivotal axis 15 serve to enable radial excursions of the track to be followed by the radiation spot 7.
  • Pivotal movements 14 about the pivotal axis 16 serve to permit time-error corrections in tangential directions.
  • pivotal movements about any pivotal axis passing through the intersection S of the optical axis 11 and the two pivotal axes 15 and 16 and disposed in the plane defined by the axes 15 and 16 are possible.
  • pivotal movements about pivotal axes other than said two pivotal axes may always be regarded as a combination of two pivotal movements about the said pivotal axes.
  • the electrically controllable focussing means for electrically effecting and controlling the pivotal movements 13 and 14 of the objective will be discussed in more detail hereinafter.
  • the combined bearing arrangement for the objective 6 comprises a plain bearing arrangement which comprises a stationary bearing member 17 which is substantially coaxial with the optical axis 11 of the objective and is connected to frame 5 and which has an outer bearing surface 18 which is convexly curved about axes perpendicular to the optical axis 11, as well as a movable bearing member 19 which is connected to the objective 6 and has a cylindrical inner bearing surface 20 which cooperates with the convex outer bearing surface 18 of the stationary bearing member 17, in a sliding and pivoting manner and with a certain bearing clearance.
  • the lens system 10 is situated near the upper end 8 of the objective 6.
  • the combined bearing arrangement is situated near the lower end 9 of the objective and the objective comprises a sleeve 22 in which the lens system is mounted.
  • said sleeve At its upper end said sleeve, as is apparent from Fig. 1, has a portion with a circular-cylindrical outer wall and a portion with plane outer walls.
  • the sleeve Internally the sleeve is circular-cylindrical throughout its length, a portion 23 near the lower end having a slightly greater diameter than the upper portion of the sleeve.
  • the objective is open.
  • the frame 5 is provided with a bearing support 21, which extends into the portion 23 of the sleeve 22 through the open lower end and which has a free end 24 which is directed towards the lens system 10.
  • the stationary bearing member 17 is disposed on the bearing support 21 and the movable bearing member 19 is constituted by a portion of the wall of the sleeve portion 23.
  • the stationary bearing member 17 is constituted by an annular portion of the bearing support 21 and is integral with the support 21.
  • the bearing support 21 is hollow over its entire length and is open at the free end 24. A portion of the hollow bearing support constitutes a housing for an optical component 25, which cooperates with the radiation beam 2. Said component is a glass component with a ground reflecting surface 26 and is glued in the bearing support 21. In its side wall the bearing support 21 has an opening 27 for the passage of the light beam 2. By means of the reflecting surface 26 the beam 2, which enters the space inside the bearing support 21 through the opening 27, is reflected through 90 0 in the direction of the lens system 10. The light beam which is reflected by the video disc 3 is also reflected by the reflecting surface 26 and emerges through the opening 27.
  • the bearing support 21 comprises a cylindrical stop portion 28 which is substantially coaxial with the optical axis 11 of the lens system 10.
  • the sleeve 22 of the objective has an inner wall 29 which surrounds said cylindrical stop portion with some clearance in order to limit the pivotal movements of the objective relative to the bearing support 21.
  • the bearing support 21 and the sleeve 22 of the objective are provided with conical seating surfaces 30 and 31 which, in the rest position of the objective, cooperate with each other and which are inclined relative to the optical axis 11 of the lens system.
  • the drawing shows the objective in the operating position, so that there is clearance between the seating surfaces. Said surfaces serve to provide a well-defined and substantially non-inclined rest position of the objective relative to the bearing support 21.
  • the electrically controllable.focussing means and pivoting means comprise magnetically cooperating electrodynamic means.
  • Said means comprise moving electrodynamic means which are connected to the objective 6 and are constituted by four control coils 32 to 35, and stationary electrodynamic means which are connected to the frame 5 and comprise an axially magnetised annular magnet 36 which surrounds the bearing support 21.
  • Said magnet is included in a magnetic circuit with polepieces 37 to 40 which each extend into a respective one of the control coils 32 to 35 through an end thereof and which are glued to the annular magnet 36.
  • Each of the polepieces comprises two separate portions, which are designated A and B, between which a small air gap is formed.
  • the magnetic circuit further comprises an iron base plate 41, four iron supports 42, and four iron yoke portions 43 to 46 which complete the permanent circuit.
  • the base plate 41, the supports 42 and the yoke portions 43 to 46 are connected to each other by means of bolts 47.
  • control coils 32 to 35 With the aid of the electrodynamic means it is possible, by applying electric control currents to the control coils 32 to 35, to exert electromagnetic forces on the objective 6 for effecting the focussing movements 12 and the pivotal movements 14 and 15.
  • the control coils are situated at the sides of the sleeve 22, near the lower end 9 of said sleeve. They are oriented in such a way relative to the sleeve that the electrodynamic forces F on the objective 6 substantially pass through a common point C on the optical axis 11 of the lens system. Said point substantially coincides with the centre of percussion of the objective 6.
  • each of the control coils 32 to 35 are disposed in planes which are perpendicular to an imaginary connecting line (see the lines 48 and 49 in Fig. 2) between the centre of the respective coil and the centre of percussion C.
  • an imaginary connecting line see the lines 48 and 49 in Fig. 2
  • fins 50A, 50B to 53A, 53B arranged in pairs in planes which are substantially parallel to the optical axis 11, which fins have free ends on which the control coils 32 to 35 are mounted.
  • the fins are interconnected by means of thin connecting portions 54 between adjacent pairs of fins and a connecting portion 55 between the two fins of each pair of fins.
  • the sleeve 22 and the fins 50A, B to 53A, B, the connecting portions 54 and the connecting portions 55 all form part of a single integral component 56 which is made of a suitable material.
  • the material should be selected so that the objective 6 combines a minimal weight with a maximal rigidity, whilst obviously considerations of manufacturing technology also play a part in the choice of the material.
  • One possibility is a diecast product of an aluminium alloy or an injection-moulded product of a high-quality platics.
  • the coils 32 to 35 are glued to the magnet 36.
  • the fins and the connecting portions have a minimal thickness in order to minimise the sound pressure of the component 56 during the movements 12.
  • Fig. 4 is an optical apparatus 101 which, except for some modifications, is identical to the optical apparatus 1 of Figs. 1 to 3.
  • the details of the apparatus 101 which correspond to details of the apparatus 1 will therefore not be discussed any further, and components to which reference is necessary for the description of the modifications and which correspond to components in the optical apparatus 1, are designated by reference numerals which are increased by 100 in comparison with the reference numerals of said corresponding parts.
  • the lower end portion of the hollow bearing support 121 accommodates a semiconductor laser 157, which is mounted on a support 158 on a base 159.
  • the diverging light beam 102 emitted by the semiconductor laser is formed into a parallel beam by means of an optical system 160, which beam is directed towards the lens system 110 via the optical element 125, whose reflecting surface 126 is now semi-transparent.
  • An optical apparatus provided with such a light path is for example known from United States Patent Specification No. 4,135,083 (herewith incorporated by reference).
  • the optical apparatus in accordance with the previously mentioned United States Patent Specification No. 4,135,206 (herewith incorporate by reference) is also intended for such a light path.
  • Fig. 5 relates to a detail of a modified optical apparatus which, except for the bearing arrangement, may be identical to the apparatus 1 or the apparatus 101.
  • the Figure shows a bearing support 221 to which a stationary bearing member 217 is secured.
  • This bearing member comprises a first and a second pair of convex outer bearing surfaces.
  • the first pair of surfaces 218A, 218B comprises two part-cylindrical surfaces which are disposed diametrically opposite one another on an imaginary first circular cylinder 270 (shown in broken lines) having a first axis 215 which is substantially perpendicular to the optical axis 211 of the lens system, not shown.
  • the second pair of surfaces 218C and 218D comprises two part-cylindrical surfaces which are disposed diametrically opposite one another on an imaginary second circular cylinder 271 having a second axis 216, which is also substantially perpendicular to the optical axis 211, and having a diameter equal to that of the first circular cylinder 270.
  • the sleeve 223 has a bore of square cross-section so that the inner wall 220 is constituted by plane surfaces which are perpendicular to each other. These plane surfaces surround the convex surfaces 218A to D with some bearing clearance, so that the imaginary cylinders 270 and 271 are each situated between opposing plane-surfaces with some clearance.
  • the sleeve 223 can thus perform focussing movements 212 along the optical axis 211 and pivotal movements 213 about the axis 215 of the first circular cylinder 217 as well as pivotal movements 214 about the axis 216 of the circular cylinder 271. In principle other movements are not possible, apart from the very small movements which may be allowed by the bearing clearance.

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Optical Head (AREA)
EP81200785A 1980-07-31 1981-07-08 Optisches Gerät zum Aufzeichnen oder Wiedergeben von Informationsspuren mittels eines Strahlungsbündels Expired EP0045538B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81200785T ATE11463T1 (de) 1980-07-31 1981-07-08 Optisches geraet zum aufzeichnen oder wiedergeben von informationsspuren mittels eines strahlungsbuendels.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8004380A NL8004380A (nl) 1980-07-31 1980-07-31 Optische inrichting voor het met een stralingsbundel inschrijven en/of uitlezen van registratiesporen.
NL8004380 1980-07-31

Publications (2)

Publication Number Publication Date
EP0045538A1 true EP0045538A1 (de) 1982-02-10
EP0045538B1 EP0045538B1 (de) 1985-01-23

Family

ID=19835687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200785A Expired EP0045538B1 (de) 1980-07-31 1981-07-08 Optisches Gerät zum Aufzeichnen oder Wiedergeben von Informationsspuren mittels eines Strahlungsbündels

Country Status (12)

Country Link
US (1) US4394755A (de)
EP (1) EP0045538B1 (de)
JP (1) JPH0316695B2 (de)
KR (2) KR830006704A (de)
AT (1) ATE11463T1 (de)
AU (1) AU541891B2 (de)
CA (1) CA1183256A (de)
DD (1) DD201739A5 (de)
DE (1) DE3168469D1 (de)
ES (1) ES504390A0 (de)
HK (1) HK57686A (de)
NL (1) NL8004380A (de)

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JPS56119717A (en) * 1980-02-27 1981-09-19 Kawasaki Steel Corp Method for detecting condition of converter
FR2522861B1 (fr) * 1982-03-02 1988-01-08 Thomson Csf Tete optique d'ecriture-lecture d'un disque optique et dispositif optique associe a une telle tete
DE3234288C2 (de) * 1982-09-16 1984-07-26 Philips Patentverwaltung Gmbh, 2000 Hamburg Optische Vorrichtung zur Lenkung bzw. Ausrichtung eines Strahlenbündels
JPS59168839U (ja) * 1983-04-28 1984-11-12 パイオニア株式会社 光学式情報読取装置における光学部品の駆動機構
NL8600168A (nl) * 1986-01-27 1987-08-17 Philips Nv Optische aftasteenheid.
US5001694A (en) * 1986-05-06 1991-03-19 Pencom International Corp. Tracking and focus actuator for a holographic optical head

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US2285768A (en) * 1940-10-11 1942-06-09 Burke & James Inc Lens mounting
US4021101A (en) * 1975-03-10 1977-05-03 U.S. Philips Corporation Optical focussing device for focussing a radiation beam
US4135206A (en) * 1977-03-25 1979-01-16 U.S. Philips Corporation Objective mount for video disc player
US4135083A (en) * 1976-05-12 1979-01-16 U.S. Philips Corporation Optical scanning device

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US4190775A (en) * 1975-02-18 1980-02-26 Agency Of Industrial Science & Technology Optical memory playback apparatus
JPS5243736A (en) * 1975-10-03 1977-04-06 Nippon Kokan Kk Metallization coating method and metallization coating alloy
DE2645326C2 (de) * 1975-10-08 1984-06-20 Olympus Optical Co., Ltd., Tokio/Tokyo Lesekopf für eine optische Lesevorrichtung
NL178915C (nl) * 1976-01-16 1986-06-02 Philips Nv Automatisch optisch focusseersysteem.
NL7713711A (nl) * 1977-12-12 1979-06-14 Philips Nv Optisch uitleeseenheid voor het uitlezen van een bewegende informatiedrager, in het bijzonder voor het uitlezen van een videoplaat.
US4302830A (en) * 1978-05-10 1981-11-24 Olympus Optical Company Ltd. Optical information reading-out apparatus
JPS5542368A (en) * 1978-09-19 1980-03-25 Mitsubishi Electric Corp Pickup controller
NL7904618A (nl) * 1979-06-13 1980-12-16 Philips Nv Optische focusseerinrichting.
JPS6034102Y2 (ja) * 1979-07-27 1985-10-11 パイオニアビデオ株式会社 可動検出部の保持装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285768A (en) * 1940-10-11 1942-06-09 Burke & James Inc Lens mounting
US4021101A (en) * 1975-03-10 1977-05-03 U.S. Philips Corporation Optical focussing device for focussing a radiation beam
US4135083A (en) * 1976-05-12 1979-01-16 U.S. Philips Corporation Optical scanning device
US4135206A (en) * 1977-03-25 1979-01-16 U.S. Philips Corporation Objective mount for video disc player

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 2, No. 2, Januar 13, 1979, page 62 E 83 & JP-A-53 129 605 (Sony) (11-10-1978) * whole Abstract * *

Also Published As

Publication number Publication date
HK57686A (en) 1986-08-15
DE3168469D1 (en) 1985-03-07
CA1183256A (en) 1985-02-26
KR830006704A (ko) 1983-10-06
DD201739A5 (de) 1983-08-03
ES8206896A1 (es) 1982-08-16
JPH0316695B2 (de) 1991-03-06
ATE11463T1 (de) 1985-02-15
AU541891B2 (en) 1985-01-24
KR850003350Y1 (ko) 1985-12-31
NL8004380A (nl) 1982-03-01
EP0045538B1 (de) 1985-01-23
ES504390A0 (es) 1982-08-16
US4394755A (en) 1983-07-19
JPS5753841A (de) 1982-03-31
AU7352381A (en) 1982-02-04

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